This paper also probes into reservoir properties of the sand-bodies and suggests that point bar and mid-channel bar sand本文还探讨了各类砂体的储集物性特徵，认爲点砂垻和心滩砂体是形成大油气田的优质储层，而油气藏的形成除与砂体的储集物性有关外，主要与区域构造条件密切相关。